In this case study, we designed a family game to explore whether this could be an effective and fun approach for raising the awareness of family members towards their energy use and, in the long run, to provide an effective tool for affecting their habits regarding sustainable behavior. The design of the family game implemented the metaphor of electricity as flowing liquid, fostered fun experiences and supported competitive and social elements. Dutch families with children, aged 5-11 years, participated in the design and evaluation of theconcept. We obtained valuable insights into the use and understanding of electricity by the families, how the families looked at responsible behaviors around their usage and how a game could integrate into the family context in a fun way.